Two particles A and B each of mass m are attached by a light inextensible string of length 2 λ . The whole system lies on a smooth horizontal table with B initially at a distance λ from A. The particle at end B is projected across the table with speed u perpendicular to AB. Velocity of ball A just after the string is taut, is –
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When the string jerk tight both particles begin to move with velocity components v in the direction AB. Using conservation of momentum in the direction AB
mu cos 30 0 = mv + mv
or v = 
Hence, the velocity of ball A just after the jerk is 
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